Files created in windows when moved to linux will have ^M character at the end of lines when you open the files in Vi editor.
To remove the strange characters open the file in Vi editor and type
This will search for the ^M pattern on the entire file and will remove all occurences.
Other option is to open the file with the strange characters and use the following search and replace pattern
In the above command you need to press ctrl+v and ctrl+m in order for you to get the character ^M in the vi editor